I have had a WP Multisite up and running for just over two years now. Everything was working fine and I just upgraded to WP 3.6.1 and for some reason my secondary sites are no longer accessible. It shows them in the database, and all the posts from the network are shown on the main page, but I can't access the individual network sites.
All of the media files are accessible and videos will play, but the individual sites won't show can't be accessed any more and I get a 404 error.
Here is my site:
Any idea about what's up?